<template>
  <div>
    <table border="1" width="700" style="border-collapse: collapse">
      <caption>
        购物车
      </caption>
      <thead>
        <tr>
          <th>
            <!-- <input type="checkbox" :checked="isAll" @change="check" /> -->
            <input type="checkbox" v-model="isAll" />

            <span>全选</span>
          </th>
          <th>名称</th>
          <th>价格</th>
          <th>数量</th>
          <th>总价</th>
          <th>操作</th>
        </tr>
      </thead>
      <tbody>
        <MyShopCar
          v-for="(item, index) in goodList"
          :key="index"
          :item="item"
          @del="del"
          @subtract="subtract"
          @add="add"
          @all="changall"
        ></MyShopCar>
      </tbody>
      <tfoot>
        <tr>
          <td>合计:</td>
          <td colspan="5">{{ totalprice }}</td>
        </tr>
      </tfoot>
    </table>
  </div>
</template>

<script>
import MyShopCar from "./components/MyShopCar.vue";
export default {
  data() {
    return {
      goodList: [
        {
          name: "诸葛亮",
          price: 1000,
          num: 1,
          checked: false,
        },
        {
          name: "蔡文姬",
          price: 1500,
          num: 1,
          checked: false,
        },
        {
          name: "妲己",
          price: 2000,
          num: 1,
          checked: false,
        },
        {
          name: "鲁班",
          price: 2200,
          num: 1,
          checked: false,
        },
      ],
      arr: [],
    };
  },
  components: {
    MyShopCar,
  },
  methods: {
    del(name) {
      this.goodList = this.goodList.filter((item) => item.name !== name);
    },
    subtract(name, num) {
      this.goodList.find((item) => item.name === name).num = num;
    },
    add(name, num) {
      this.goodList.find((item) => item.name === name).num = num;
    },
    changall(name, checked) {
      this.goodList.find((item) => item.name === name).checked = checked;
    },
  },
  computed: {
    isAll: {
      get() {
        return this.goodList.every((item) => item.checked);
      },
      set(val) {
        return this.goodList.forEach((item) => (item.checked = val));
      },
    },
    totalprice() {
      const arr = this.goodList.filter((item) => item.checked === true);
      return arr.reduce((num, item) => {
        return num + item.price * item.num;
      }, 0);
    },
  },
};
</script>

<style></style>
